Ethan Silverstein and Greg Kuhlman of Cushman & Wakefield brokered the deal for the landlord while Newmark Knight Frank’s Jared Horowitz and Ben Shapiro handled it for Knotel. A spokesman for NKF did not respond to a request for comment and a spokeswoman for C&W did not immediately provide a comment.

Knotel will join Orangetheory Fitness and restaurant Valerie at the 135,000-square-foot 45 West 45th Street, which Vanbarton bought for $81 million in 2015. The company recently completed a $12 million makeover in the building.